the c answer book习题解答练习1-13

编写一个程序，打印输入中单词长度的直方图。

#include <stdio.h>

#define MAXHIST 15
#define MAXWORD 11
#define IN      1
#define OUT    0

main()
{
    int c, i, nc, state;
    int len;
    int maxvalue;
    int ovflow;
    int wl[MAXWORD];
   
    state = OUT;      
    nc = 0;         
    ovflow = 0;      
    for(i = 0; i < MAXWORD; ++i)              
        wl[i] = 0;                          
    while(c = getchar() != EOF)
    {
        if(c == ' ' || c == '\n' || c == '\t')
        {
            state = OUT;
            if(nc > 0)
                if(nc < MAXWORD)
                    ++wl[nc];
                else
                    ++ovflow;
            nc = 0;
        }
        else if(state == OUT)
        {
            state = IN;
            nc = 1;
        }
        else
            ++nc;
    }
    maxvalue = 0;
    for(i = 1; i < MAXWORD; ++i)
        if(wl[i] > maxvalue)
            maxvalue = wl[i];
            
    for(i = 1; i < MAXWORD; ++i)
    {
        printf("%5d - %5d : ", i, wl[i]);
        if(wl[i] > 0)
        {
            if((len = wl[i] * MAXHIST / maxvalue) <= 0)
                len = 1;
        }
        else
            len = 0;
        while(len > 0)
        {
            putchar('*');
            --len;
        }
        putchar('\n');
    }
    if(ovflow > 0)
        printf("There are %d words >= %d\n", ovflow, MAXWORD);
        
}

书上代码，我编译运行后，只有纵向的0123456789，和0000000000

C语言里的直方图是什么样子的？

还有the c programming language 里的练习题怎么这么难啊？

都没学到过直方图，就让我画图，咱是新手啊！

难道没人知道吗？

???

哦，懂了，但我把程序运行后，无论我输入任何单词，没有见到一个 * 号这是什么道理？难道程序有错误？

我想先看到运行结果，在程序分析与学习，看不到结果，我都不知道程序对还是错